The Phillies announced that Cole Hamels will not make his scheduled start on Friday. Phillippe Aumont has been called up to start in his stead.
The Phillies beat writers announced earlier this afternoon that Cole Hamels will not take his regular turn in the rotation tomorrow evening.
Due to a mild right hamstring strain, Cole Hamels will not make his scheduled start tomorrow. RHP Phillippe Aumont will start in his place.
— Meghan Montemurro (@M_Montemurro) June 18, 2015
The Phillies are describing the strain as mild and I would tend to believe that.